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By Sam Francis
Political reporter, BBC News
Winning four seats at the next election is "absolutely realistic" despite pressure from Labour, the Green Party's co-leader has said.
Carla Denyer told the BBC the plan was "ambitious," but her party was confident after "record-breaking" gains in this year's English local elections.
The Greens have only ever had one MP, Caroline Lucas, whose Brighton Pavilion seat is a target for Labour.
Ms Denyer will open her party's annual conference in Brighton on Friday.
The conference could be the final pre-election gathering for an party that has become an increasingly effective campaigning force.
The Green Party of England and Wales had its best-ever results in May's local elections across England, winning 241 seats and taking overall control of a council for the first time - in Mid Suffolk.
The success was "the latest in a line of record-breaking results", according to Ms Denyer.
"In the last four elections, we've more than quadrupled our local election council representation," she added, giving her party hope they could repeat the feat at the general election, expected next year.
Ms Lucas, one of the party's best-known figures and its former leader, is stepping down from Parliament after 13 years as an MP.
In a speech with co-leader Adrian Ramsay, Ms Denyer will set out a target of not just keeping Ms Lucas' Brighton Pavilion seat, but winning the newly created seats of Bristol Central, Waveney Valley and North Herefordshire.
Ms Denyer told BBC Radio 4's Today programme "we think it's absolutely realistic".
In the local elections, the party's campaign focused heavily on housing - a theme which the co-leaders will pick up again in their speech later.
Ahead of the conference, the Greens announced plans to give renters the means to force landlords to insulate their homes.
Ms Denyer said the party would "guarantee everyone can afford a warm secure and affordable home".
Under the plans, tenants would be able to insist that landlords take up low-interest government-backed loans to carry out the works.
The party is also facing some financial pressures, and is proposing to increase membership fees by 50% at this conference to raise funds.